linux-kernel - Re: [PATCH v2 03/17] kunit: test: add string_stream a std::stream like string builder

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Date:   Thu, 2 May 2019 21:37:26 -0700
From:   Brendan Higgins <brendanhiggins@...gle.com>
To:     shuah <shuah@...nel.org>
Cc:     Frank Rowand <frowand.list@...il.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Kees Cook <keescook@...gle.com>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Rob Herring <robh@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
        devicetree <devicetree@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        kunit-dev@...glegroups.com, linux-doc@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-kselftest@...r.kernel.org,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        linux-um@...ts.infradead.org,
        Sasha Levin <Alexander.Levin@...rosoft.com>,
        "Bird, Timothy" <Tim.Bird@...y.com>,
        Amir Goldstein <amir73il@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Daniel Vetter <daniel@...ll.ch>, Jeff Dike <jdike@...toit.com>,
        Joel Stanley <joel@....id.au>,
        Julia Lawall <julia.lawall@...6.fr>,
        Kevin Hilman <khilman@...libre.com>,
        Knut Omang <knut.omang@...cle.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Petr Mladek <pmladek@...e.com>,
        Richard Weinberger <richard@....at>,
        David Rientjes <rientjes@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>, wfg@...ux.intel.com,
        skhan@...uxfoundation.org
Subject: Re: [PATCH v2 03/17] kunit: test: add string_stream a std::stream
 like string builder

On Thu, May 2, 2019 at 6:26 PM shuah <shuah@...nel.org> wrote:
>
> On 5/1/19 5:01 PM, Brendan Higgins wrote:
< snip >
> > diff --git a/kunit/Makefile b/kunit/Makefile
> > index 5efdc4dea2c08..275b565a0e81f 100644
> > --- a/kunit/Makefile
> > +++ b/kunit/Makefile
> > @@ -1 +1,2 @@
> > -obj-$(CONFIG_KUNIT) +=                       test.o
> > +obj-$(CONFIG_KUNIT) +=                       test.o \
> > +                                     string-stream.o
> > diff --git a/kunit/string-stream.c b/kunit/string-stream.c
> > new file mode 100644
> > index 0000000000000..7018194ecf2fa
> > --- /dev/null
> > +++ b/kunit/string-stream.c
> > @@ -0,0 +1,144 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * C++ stream style string builder used in KUnit for building messages.
> > + *
> > + * Copyright (C) 2019, Google LLC.
> > + * Author: Brendan Higgins <brendanhiggins@...gle.com>
> > + */
> > +
> > +#include <linux/list.h>
> > +#include <linux/slab.h>
> > +#include <kunit/string-stream.h>
> > +
> > +int string_stream_vadd(struct string_stream *this,
> > +                    const char *fmt,
> > +                    va_list args)
> > +{
> > +     struct string_stream_fragment *fragment;
>
> Since there is field with the same name, please use a different
> name. Using the same name for the struct which contains a field
> of the same name get very confusing and will hard to maintain
> the code.
>
> > +     int len;
> > +     va_list args_for_counting;
> > +     unsigned long flags;
> > +
> > +     /* Make a copy because `vsnprintf` could change it */
> > +     va_copy(args_for_counting, args);
> > +
> > +     /* Need space for null byte. */
> > +     len = vsnprintf(NULL, 0, fmt, args_for_counting) + 1;
> > +
> > +     va_end(args_for_counting);
> > +
> > +     fragment = kmalloc(sizeof(*fragment), GFP_KERNEL);
> > +     if (!fragment)
> > +             return -ENOMEM;
> > +
> > +     fragment->fragment = kmalloc(len, GFP_KERNEL);
>
> This is confusing. See above comment.

Good point. Will fix in the next revision.

< snip >

Thanks!